public function actionOrders($order_id = null)
 {
     $model = new Orders();
     $all_orders = $model->select_orders();
     if (isset($_POST['new_order'])) {
         $new_order_id = $_POST['new_order'];
         $old_order_id = $_POST['old_order'];
         $model->edit_orders($new_order_id, $old_order_id);
         die;
     }
     $max_id = $model->max_id();
     $this->render('orders', array('all_orders' => $all_orders, 'max_id' => $max_id));
 }